Soluble microbial products (SMPs) in the effluent from a submerged anaerobic membrane bioreactor (SAMBR) under different HRTs and transient loading conditions

Abstract

This study investigated the performance of a submerged anaerobic membrane bioreactor (SAMBR) fed with synthetic wastewater (544 ± 22 mgCOD/L) operating at different hydraulic retention times (HRTs-12 h, 8 h, 6 h, 4 h, 2 h, and 1 h) at both steady state, and under transient load conditions (2 and 1 h), and the SMPs produced under these conditions. COD removal at decreasing HRTs (12 h, 8 h, 6 h, 4 h, and 2 h) was high (>94%), but decreased to 80% when operating at 1 h HRT. VFAs accumulated when the HRT was decreased to 2 h and 1 h, accounting for 69% and 89% of the effluent COD, respectively. Effluent SMPs accounted for an average of 14±2 mgCOD/L at steady state, but this fluctuated more during transient conditions (12±6 mgCOD/L). The COD *Revised Manuscript (clean for typesetting) Click here to view linked References

Performance evaluation and organic mass balance for treatment of high strength wastewater by anaerobic hybrid membrane bioreactor

“…The term Y ( S in – S eff )Q in represents the fraction of COD converted into biomass. This term has not been considered by previous researchers during COD mass balance studies and it forms a substantial fraction in mass balance.…”

“…Wastewater treatment is one of the most fundamental aspects of protecting water resources for protection of environment as well as public health, in both developing and developed countries. Wastewater treatment not only evades drawing on water resources, but also enables a substantial decrease in the amount of wastewater released into the natural environment . Various conventional approaches such as activated sludge process (ASP), upflow anaerobic sludge blanket (UASB), upflow anaerobic bio‐filter process, sequential batch reactor, and hybrid reactors are widely applicable for treatment of wastewater .…”

“…AnMBR system possesses a number of advantages over other conventional wastewater treatment processes, like high‐quality effluent, reduced footprint, systematic energy generation, low sludge production, that is, 20 times lower than aerobic one and providing high treatment efficiency . AnMBR enables independent regulation for sludge retention time (SRT) and hydraulic retention time (HRT) and facilitates small footprint reactor for treating the huge volume of water . Moreover, incorporation of membrane with anaerobic reactors offers the possibility to keep wastewater effluent devoid of any suspended solids by retaining the biomass within the reactor .…”

“…AnMBR enables independent regulation for sludge retention time (SRT) and hydraulic retention time (HRT) and facilitates small footprint reactor for treating the huge volume of water . Moreover, incorporation of membrane with anaerobic reactors offers the possibility to keep wastewater effluent devoid of any suspended solids by retaining the biomass within the reactor . High biomass retention within the reactor allows to withstand high organic load and high organic removal which provides excellent quality of effluent (low particulate matter and pathogens) .…”

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

“…The behavior of landfill leachate treated by SAMBR is similar with a HRT equal to two days and a leachate percentage within the reactor of about 20%. However, a gradual decrease in organic removals was observed as the leachate percentage increased [80] and HRT decreased [81].…”